I have an intriguing issue that I have yet to find a solution too. I am trying to insert multiple sketch planes along a simple 2D curve. I will be using the planes for loft sketches. The sketch planes are normal to the curve, but for some reason they twist along the curve. I cannot seem to orient them so that the Z axis of the plane lines up with the global Z by the end of the convex curve.
Realistically, I could relate the sketch on every plane to the origin but the sketch planes skew the angles and it would be a bit of a mess.